Part identification needed

[03f250stroke]

Hello, I was going through some boxes and came across a box with valve springs and gsk kit. This part was in there. Not sure what it is, I was hoping someone could tell from the pictures. It may be nothing and just got thrown into the box.

Thanks in advance.

 

[CatDieselPower]

Looks like an AFC diaphragm washer.

 

[12valve95]

^^ This^^

 

[03f250stroke]

Looks like an AFC diaphragm washer.

Much appreciated Sir.